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Comparing gvpe/src/iom.h (file contents):
Revision 1.4 by pcg, Fri Mar 21 23:17:01 2003 UTC vs.
Revision 1.23 by pcg, Fri Nov 12 02:53:29 2004 UTC

1/* 1/*
2 iom.h -- I/O multiplexor 2 iom.h -- generic I/O multiplexor
3 Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com>
3 4
4 This program is free software; you can redistribute it and/or modify 5 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by 6 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or 7 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version. 8 (at your option) any later version.
… …
14 You should have received a copy of the GNU General Public License 15 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software 16 along with this program; if not, write to the Free Software
16 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17*/ 18*/
18 19
19#ifndef VPE_IOM_H__ 20#ifndef IOM_H__
20#define VPE_IOM_H__ 21#define IOM_H__
21 22
22#include <vector> 23// required:
24// - a vector template like simplevec or stl's vector
25// - defines for all watcher types required in your app
26// edit iom_conf.h as appropriate.
27#include "iom_conf.h"
23 28
24#include <sys/poll.h> 29#include "callback.h"
25 30
26#include "slog.h" 31#ifndef IOM_IO
32# define IOM_IO 0
33#endif
34#ifndef IOM_TIME
35# define IOM_TIME 0
36#endif
37#ifndef IOM_CHECK
38# define IOM_CHECK 0
39#endif
40#ifndef IOM_IDLE
41# define IOM_IDLE 0
42#endif
43#ifndef IOM_SIG
44# define IOM_SIG 0
45#endif
46#ifndef IOM_ACCURACY
47# define IOM_ACCURACY 0.001 // start timers at most this much earlier (can be 0)
48#endif
27 49
28typedef double tstamp; 50typedef double tstamp;
29
30extern tstamp NOW; 51extern tstamp NOW;
31 52
32template<class R, class A> class callback; 53struct watcher;
54#if IOM_IO
33struct io_watcher; 55struct io_watcher;
56#endif
57#if IOM_TIME
34struct time_watcher; 58struct time_watcher;
59#endif
60#if IOM_CHECK
61struct check_watcher;
62#endif
63#if IOM_IDLE
64struct idle_watcher;
65#endif
66#if IOM_SIG
67struct sig_watcher;
68#endif
35 69
70template<class watcher>
71struct io_manager_vec : vector<watcher *> {
72 void erase_unordered (unsigned int pos)
73 {
74 watcher *w = (*this)[this->size () - 1];
75 this->pop_back ();
76
77 if (!this->empty ())
78 if (((*this)[pos] = w)) // '=' is correct!
79 w->active = pos + 1;
80 }
81};
82
83// only used as a namespace, and for initialisation purposes
36class io_manager { 84class io_manager {
37 vector<pollfd> pfs; 85 template<class watcher>
38 vector<io_watcher *> iow; 86 static void reg (watcher &w, io_manager_vec<watcher> &queue);
39 vector<time_watcher *> tw; // actually a heap
40 87
41 void idle_cb (tstamp &ts); time_watcher *idle; 88 template<class watcher>
89 static void unreg (watcher &w, io_manager_vec<watcher> &queue);
90
42public: 91public:
43
44 // register a watcher 92 // register a watcher
45 void reg (int fd, short events, io_watcher *w); 93#if IOM_IO
46 void unreg (io_watcher *w); 94 static void reg (io_watcher &w); static void unreg (io_watcher &w);
47 void reg (time_watcher *w); 95#endif
48 void unreg (time_watcher *w); 96#if IOM_TIME
97 static void reg (time_watcher &w); static void unreg (time_watcher &w);
98#endif
99#if IOM_CHECK
100 static void reg (check_watcher &w); static void unreg (check_watcher &w);
101#endif
102#if IOM_IDLE
103 static void reg (idle_watcher &w); static void unreg (idle_watcher &w);
104#endif
105#if IOM_SIG
106 static void reg (sig_watcher &w); static void unreg (sig_watcher &w);
107#endif
49 108
50 void loop (); 109 static void loop ();
51
52 io_manager ();
53 ~io_manager ();
54}; 110};
55 111
56extern io_manager iom; 112struct watcher {
113 int active; /* 0 == inactive, else index into respective vector */
57 114
115 watcher () : active (0) { }
116};
117
118#if IOM_IO
119enum { EVENT_READ = 1, EVENT_WRITE = 2 };
120
121struct io_watcher : watcher, callback2<void, io_watcher &, short> {
122 int fd;
123 short events;
124
125 void set (int fd_, short events_) { fd = fd_; events = events_; }
126
127 void set (short events_) { set (fd, events_); }
128 void start () { io_manager::reg (*this); }
129 void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); }
130 void stop () { io_manager::unreg (*this); }
131
58template<class R, class A> 132 template<class O1, class O2>
59class callback {
60 struct object { };
61
62 void *obj;
63 R (object::*meth)(A arg);
64
65 // a proxy is a kind of recipe on how to call a specific class method
66 struct proxy_base {
67 virtual R call (void *obj, void (object::*meth)(A), A arg) = 0;
68 };
69 template<class O1, class O2>
70 struct proxy : proxy_base {
71 virtual R call (void *obj, void (object::*meth)(A), A arg)
72 {
73 ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<void (O2::*)(A)>(meth)))
74 (arg);
75 }
76 };
77
78 proxy_base *prxy;
79
80public:
81 template<class O1, class O2>
82 callback (O1 *object, void (O2::*method)(A))
83 {
84 static proxy<O1,O2> p;
85 obj = reinterpret_cast<void *>(object);
86 meth = reinterpret_cast<void (object::*)(A)>(method);
87 prxy = &p;
88 }
89
90 R call(A arg)
91 {
92 return prxy->call (obj, meth, arg);
93 }
94
95 R operator ()(A arg)
96 {
97 return call (arg);
98 }
99};
100
101struct io_watcher : callback<void, short> {
102 template<class O1, class O2>
103 io_watcher (O1 *object, void (O2::*method)(short revents)) 133 io_watcher (O1 *object, void (O2::*method) (io_watcher &, short))
134 : callback2<void, io_watcher &, short> (object,method)
135 { }
136 ~io_watcher () { stop (); }
137};
138#endif
139
140#if IOM_TIME
141struct time_watcher : watcher, callback1<void, time_watcher &> {
142 tstamp at;
143
144 void trigger ();
145
146 void set (tstamp when) { at = when; }
147 void operator () () { trigger (); }
148 void start () { io_manager::reg (*this); }
149 void start (tstamp when) { set (when); io_manager::reg (*this); }
150 void stop () { io_manager::unreg (*this); }
151
152 template<class O1, class O2>
153 time_watcher (O1 *object, void (O2::*method) (time_watcher &))
154 : callback1<void, time_watcher &> (object,method), at (0)
155 { }
156 ~time_watcher () { stop (); }
157};
158#endif
159
160#if IOM_CHECK
161// run before checking for new events
162struct check_watcher : watcher, callback1<void, check_watcher &> {
163 void start () { io_manager::reg (*this); }
164 void stop () { io_manager::unreg (*this); }
165
166 template<class O1, class O2>
167 check_watcher (O1 *object, void (O2::*method) (check_watcher &))
168 : callback1<void, check_watcher &> (object,method)
169 { }
170 ~check_watcher () { stop (); }
171};
172#endif
173
174#if IOM_IDLE
175// run after checking for any i/o, but before waiting
176struct idle_watcher : watcher, callback1<void, idle_watcher &> {
177 void start () { io_manager::reg (*this); }
178 void stop () { io_manager::unreg (*this); }
179
180 template<class O1, class O2>
181 idle_watcher (O1 *object, void (O2::*method) (idle_watcher &))
104 : callback<void, short>(object,method) 182 : callback1<void, idle_watcher &> (object,method)
105 { } 183 { }
106 184 ~idle_watcher () { stop (); }
107 void start (int fd, short events)
108 {
109 iom.reg (fd, events, this);
110 }
111
112 void stop ()
113 {
114 iom.unreg (this);
115 }
116}; 185};
186#endif
117 187
118#define TSTAMP_CANCEL -1. 188#if IOM_SIG
189struct sig_watcher : watcher, callback1<void, sig_watcher &> {
190 int signum;
119 191
120struct time_watcher : callback<void, tstamp &> { 192 void start (int signum);
121 tstamp at; 193 void stop () { io_manager::unreg (*this); }
122 194
123 template<class O1, class O2> 195 template<class O1, class O2>
124 time_watcher (O1 *object, void (O2::*method)(tstamp &)) 196 sig_watcher (O1 *object, void (O2::*method) (sig_watcher &))
125 : callback<void, tstamp &>(object,method) 197 : callback1<void, sig_watcher &> (object,method), signum (-1)
126 { } 198 { }
127 199 ~sig_watcher () { stop (); }
128 void set (tstamp when);
129 void trigger ();
130
131 void operator ()()
132 {
133 trigger ();
134 }
135
136 void start ();
137 void start (tstamp when)
138 {
139 set (when);
140 }
141
142 void stop ()
143 {
144 iom.unreg (this);
145 }
146
147 void reset (tstamp when = TSTAMP_CANCEL)
148 {
149 stop ();
150 at = when;
151 }
152}; 200};
153
154#endif 201#endif
155 202
203#endif
204

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